Artificial tooth with metal anchorage



H. BITTER Jan. 22, 1957 ARTIFICIAL TOOTH WITH METAL ANCHORAGE FiledMarch 22, 1955 HEkMA/vA/ B/TTER A TTORIVEYS ARTIFICIAL TOOTH WITH METALANCHORAGE 5 Hermann Bitter, Osnabruck, Germany Application March 22,1955, Serial N 0.

application Germany June 15, 1954 5 Claims. (CI. 32-10) Claims priority,

Artificial teeth for th are made of porcelain e production of dentalprostheses Artificial front and ntal facets of which labial half,consists ds or pins, so-called and fitted on the fiat- -shaped arms hefront ends ecesses in the ry simple and engage. Balls may also b of theprojecting U th with such teeth -shaped holding members set ofartificial tee Patented Jan. 22, 1957 to spread resiliently the arms ofthe U-shaped metal part to enable them to engage in the correspondingrecesses in the tooth. When removing such a tooth from the mounting withslight pressure to overcome the resiliency of the arms of the U-shapedbody. Dental cement is used as binding medium between the U-shaped bodyand the tooth. I

Two embodiments of the invention are illustrated by way of example inthe accompanying drawing, in which:

Fig. 2 is a vertical transverse cross-section of the tooth taken on lineIIII of Fig. 1, and

Fig. 3 shows a modified construction taken on a plane similar to thatindicated by the line I-I in Fig. 2.

A solid bodied tooth 1 of plastic or porcelain is used.

cess, seen transversely tothe tooth, is greatest on the neck side andnarrows the further it projects at the edges 5, 5 towards the'cuttingedge.

This recess accommodates a correspondingly U-shaped 4 which tapertowards the cutting edge of the tooth and engage in the lateralextensions 5, 5 of the recess 2 extending towards the cutting edge ofthe tooth on the side edges thereof.

The lateral extensions 5, 5 of the recess 2 and the arms 4, 4 engagingtherein terminate at a distance from take up the chewing pressure.

At the base of the anchorage 3 the arms 4, 4' can come more or lessclose together and even meet to form a V-shaped joint.

The U-shaped recess 2 and the metal anchorage 3 with the projecting arms4, 4 have approximately the same sectional shape. Although slightdeviations between the two parts can be compensated by the dental cementwhich is used when the metal anchorage is finally inserted in the tooth,the fitting is rendered more easy, even when the two cross-sections donot entirely coincide, if the lateral extensions 5, 5' of the recess 2have at their front ends of their internal boundary surfaces cavities.6, 6' which are, for example, of spherical shape and if difficulties donot a with rigidly fixed tooth in its U exert a certain the case of rigi-shaped body spherical projections. When fitting a shaped body it isalway amount of force on the U- dly mounted spherical projections inorder the projecting arms 4, 4 of the anchorage have on their inneredges at the height of these cavities 6, 6 projections 7, 7' which are,for example, likewise of spherical shape. Even when the inner edges ofthe arms 4, 4 do not bear on the inner boundary sides of the extensions5.

their entire length, the metal anchorage is given a firm seating by thesaid projections 7, 7' which, so to speak, lock in the cavities 6, 6'when the anchorage is introduced into the tooth recess 2. About half waybetween the two arms 4, 4 the anchorage is provided with a metal pin 10extending towards the cutting edge of the tooth, which pin engages in acorresponding tubular bore 11 in the tooth.

The same effect can be attained it, according to the constructionillustrated in Fig. 3, balls 8 are introduced between the front ends ofthe projecting U-shaped arms 4, 4' and the inner boundary walls of theextensions 5, 5'. Also in this instance the extensions 5, 5 have ontheir inner boundary surfaces at the front ends thereof cavities 6, 6'and at the same height as these the projecting arms 4, 4 are provided ontheir inner side with cavities 9, 9' which are sufl'iciently large toaccommodate the main bulk of the balls 8, which with the portionprojecting from these cavities 9, 9' engage in the cavities 6, 6" whenthe anchorage is slipped into the tooth recess. The material and theshape of the anchorage give the arms 4, 4' sufiicient flexibility toyield resiliently in the manner necessary when introducing the anchorageinto the tooth recess.

Several such artificial teeth provided with a metal anchorage accordingto the invention can be united by soldering together the outer edges ofthe U-shaped arms 4, 4'.

I claim:

1. An artificial tooth comprising a tooth body with a recess of U-shapedsection approximately in the middle longitudinal plane, a metalanchorage of U-shaped section inserted and fixed in said recess, andlateral arms formed on said anchorage projecting toward the point of thetooth and narrowing from the neck toward the point of the tooth butterminating at a distance therefrom sufiicient to prevent the anchoragefrom being visible from, the outer side through the material of thetooth.

2. An artificial tooth comprising a tooth body with a recess of U-shapedsection approximately in the middle longitudinal plane, a metalanchorage of U-shaped section inserted and fixed in said recess, andlateral arms formed in said anchorage converging at least approximatelyin V-shape toward the neck of the tooth and projecting toward the pointof the tooth but terminating at a distance therefrom sufficient toprevent the anchorage from being visible from the outer side through thematerial of the tooth.

3. An artificial tooth as set forth in claim 1, wherein the lateralrecess provided in the tooth has at the front ends of its inner boundarywalls cavities of substantially spherical shape and. he inner edges ofthe lateral arms of the metal anchorage are provided with projections atapproximately the height of and engaging in these cavities.

4. An artificial tooth as set forth in claim 1, wherein the lateralrecess provided in the tooth has at the front ends of its inner boundarywalls cavities of substantially spherical shape and the inner edges ofthe lateral arms of the metal anchorage are also provided with cavitiesat approximately the height of the cavities in the inner boundarywallsof the recess in the tooth, and balls are mounted in the cavitiesin the tooth and engage in the cavities in the anchorage.

5. An artificial tooth as set additionalmeans are provided for securingthe anchorage in the tooth body and consist of a metal pin midwaybetween the two arms of the metal anchorage extending towards the pointof the tooth, which arm engages in a corresponding tubular bore in thetooth body.

forth in claim 1, wherein References Cited in the file of this patentUNITED STATES PATENTS 2,213,964 M35 03 Sept. 10, 1940

